666010999 has 2 divisors, whose sum is σ = 666011000. Its totient is φ = 666010998.

The previous prime is 666010979. The next prime is 666011029. The reversal of 666010999 is 999010666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666010999 - 2⁵ = 666010967 is a prime.

666010999 is a strobogrammatic number because it is the same when read upside-down.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666010949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333005499 + 333005500.

It is an arithmetic number, because the mean of its divisors is an integer number (333005500).

Almost surely, 2^666010999 is an apocalyptic number.

666010999 is a deficient number, since it is larger than the sum of its proper divisors (1).

666010999 is an equidigital number, since it uses as much as digits as its factorization.

666010999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 666010999 is about 25807.1889015445. The cubic root of 666010999 is about 873.2939815644.

The spelling of 666010999 in words is "six hundred sixty-six million, ten thousand, nine hundred ninety-nine".